Spring



Sept. 1, 1925'.

w H. M. SCHMITZ SPRING Filed Oct. 20. 1924 I-IEnTH M Echmlz PatentedSept. 1, 1925.

UNIT En sir Afr Es 1P .Air sur i .ossi-.ica

HENRY IvL. SCHMITZ, on MILWAUKEE, WISCONSIN.

p SPRING.

Application filed October 20, 1924.A Serial No. 744,783.;

To all whom t may 'concern Be it known that I, HENRY M. SCHMITZ, acitizen et' the United States, 'and resident of liilwauke'e, inthecounty of Milwaukee and State of llisconsin, have inventedicerain newand usefulr Improvements Springs; and 1 do hereby declare that thefollowing is a full, cle'ar, and exact 'description thereof,

This inventiofn'relates t'o springs. v

Qbje'cts on this invention are to provide spring which may be formedinthe manner of accinpositeleaf-spring, which will lubri cate itselfY andinsure proper` lubrication between each of the -several underlyingyleaves of the composite spring,- which has a.v greater streng'tli forthe same weight o f material than springs heretofore constructed, andwhich'is so designed that it may bereadily produced,

Although this spring may be employed in a wide varietyfof places, it isparticularly applicable for use in automobile construction, and is soconstructed that the center aperture for the retaining bolt is avoidedand thus an increase of strength and freedom from crystallization issecured.

A further object is to provide a spring in which the main leaf is soconstructed that it will retain the lubricant and conduct it to thedesired places without any leakage, and more specifically to provide amain leaf which is formed from a tubular member.

An embodiment of this invention is shown in the accompanying drawings,in which Figure 1 shows thecomplete spring.

Figure 2 is an enlarged vertical sectional view through a portion of thespring showing the main leaf in section.

Figure 3 is transverse section on the line of Figure 2.

Figure l is a sectional view of the tube from which the main leaf isformed.A

Referring in detail to the drawings, it will be seen that the spring isa composite leaf spring and comprises a main leaf 1 having rolledeyelets 2 at its outer ends, and that a plurality of auxiliary springs 3are positioned in contact with said main spring in the usual manner.

In forming the main leaf of this spring a tubular member, such asindicated at 4 in Figure ll, is employed. This tubular membei' isflattened so as to provide completely flattened side members 5, and acentrally located rib 6, This centrally formed rib 6 inv extends fromadjacent the ends of the'spring towards the center and is interrupted atthe centerv to provide aspace 7 for the reception of 'a clip of anydesiredcharacter, whereby the central portion of the spring maybe.secured' in position, `thus avoiding the usual bolt hole with` theconsequent weakening and crystallization of thecentral portion Yofthespring', as frequently occursv in the'usualy typcsfofsprings. ,f

JK.t will be notedfrom Figure .Qthat the. ends of the main leaf '1 ,2are completely flattened and are rolled. into eyelettf'orm, as indicatedat 2. Further, from Figures 2 and 3, it'will b'c seen 1 that the centralrib '6/ provices a channel or oil passage8witlrin the main body of theleaf. This. central passage is not of the nfat-ureioffagro'ovebut' is inreality a passage{located-'within the. fualbody portion of the -rnainleaf 1'.- The ons ofthe ribs'i 'are eachprovidedwith; tl'ireadc'dlapertures. y9 on theirfupper sidesy adapted to receive the threadstems'of the oil cups 10,Y as shown in Figures 1 and 2. Further, thebottom fac-e or contacting face of the main leaf 1 is provided with aplurality of apertures 11 which are adapted to discharge oil andconsequently keep the bearing faces well lubricated. Obviously, theauxiliary springs may also be provided vith apertures to permit the oilto freely flow to other portions of the composite springs, if desired,otherwise the oil will be discharged, as stated, through theapertures 11and will find its way over the sides of the auxiliary springs and willenter between their marginal edges.

It is to be noted that the ribs 6 serve the three fold purpose ofproviding oil passages within the body of the main leaf, of providingribs between which the securing central clips may be most easilyretained and further of providing an increased strength of main leaf dueto the cross sectional contour thereof.

It will thus be seen that a leaf spring construction has been providedwhich may be easily formed, which is cheap to manufacture, and which ishighly eticient in maintaining lubrication.

Although the invention has been described in considerable detail, it isto be understood that the invention may be variously embodied and is,therefore, to be limited only as claimed;y

I claim:

l. A composite leaf spring comprising a plurality of leaves, one leafhaving a tubular formation with an internal oil carrying channel andhaving apertures for the distribution of oil.

2. A composite leaf spring comprising a main leaf and al plurality ofauxiliary leaves, said main leaf being of iiattened tubular constructionand having a channel located internally therein and having oil dischargeapertures opening into said channel.

3. A composite leaf spring comprising a main leaf and an auxiliary leaf,said main leaf having an oil passage formed through its body andcompletely closed through its major extent and having oil dischargeapertures communicating with said passage.

4. A leaf spring co-mprising a main leaf and a plurality of auxiliaryleaves, said main leaf being a flattened tube having an outwardlypressed rib on one side forming an internal oil channel, and having oildischarge apertures communicating with said oil channel. y

5.v A composite leaf spring comprising a main leaf and a plurality ofauxiliary leaves, said main leaf consisting of a iiattened tube havingtwo centrally located, outwardly pressed ribs on one side and extendingfrom opposite ends towards the center and having ytheir innerjuxtaposedl ends spaced apart, the other side of said leaf being fiatthrough its extent and contacting with the .next adjacent leaf of thecomposite leaf .and a plurality of auxiliary leaves, said main leafconsisting of a flattened tube having a pair of centrally located ribsextending from opposite ends and spaced apart at the center, said ribsforming internal oil channels in the ina-in leaf, and said mainleafhaving a plurality of apertures opening into said channel. I l t Y(y. A leaf spring comprising a main leaf formed of a tube and havingflattened sides and a central rib, said rib being interrupted at thecenter of said leaf and having oil cup receiving apertures at its outerends, said ribs forming oil channels and said leaf having oil dischargeapertures communicating with said channels, and a plurality of auxiliaryleaves cooperating with said main leaf.

ln testimony that I claim the foregoing I have hereunto set my hand atMilwaukee, in the county of Milwaukee and State of Visconsin.

HENRY M. scHMi-Tz.

